What really worries us is __________the explorers can accurately locate themselves with the old devi...
2022-05-31 22:46:10 89次 上海市2017-2018学年高二上学期期中英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
What really worries us is __________the explorers can accurately locate themselves with the old device in case of bad weather.
A.that B.where C.what D.whether
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